Your color choice is one of my favorites. It's not red or pink, exactly.
For pictures have you thaught of a:
Autumn leaves with a scenery
A portrait of someone who inspires you
Inspiring poems by famous poets!!!!
A portrait of the kennedy's
Sceneries in different states, countries etc.
Sedona Arizona has some beautiful scenery!
Pictures of another era, culture, with either a person or people doing something.
The oceans underneath?
A new york skyline
The eifle tower? In paris.
Castles in scotland or otherwise
Pictures of the remains in greece
Zen-like photos: Fire, water, wood, metal and earth elements.
Music notes, a guitar, piano, harp, or singer.
A mystical scene; like fairies, angels, solar system, sun, planet, space etc.
How about simple pictures like a picture of a vase, tree, plate, fruit, home, a picture of every season of the year, a beautiful fabric from india, moracco etc., fashion designs of different designers like coco chanel, Versace etc. or a picture of candles lit.
Black and white photos of happy times in your life. When it comes to these kinds of photos, they look better in black and white ( with black frames).
Or you could do black and white of anything else, especially the people photos of others doing something simple in their everyday life, like waiting for the subway or having a cocktail drink etc.
Picture paintings of your favorite artists: try pablo picasso, monet, Georgia O'keefe, Van Gogh etc.
As far as, devian art (which is a great site), photobucket, istock and flicker; you would have to look because their are so many nice pictures on these sites, and it's truly about what captures your eye not mine.
I like your idea, but definitely get alot of pictures because our moods change as we change daily. This will help you from having to repaint the wall.
Go crazy with color, and don't be afraid to use pictures you think might not match. Mixing and matching are great ways to decorate. This is what can make a statement. It's important to love what you frame. I couldn't look at a picture I didn't like on a daily basis, just because it matches the scheme I'm working on.
I've gone to elegant homes and have noticed artwork or pictures from everywhere, or anything that suits their whim.
I would also consider getting more frames, just in case you feel the need for more.
How about 6 to 9 frames on one wall or 4. You could put 2 on each wall also.
Get some frames in gold, silver, black and wood (maybe the antique wood look).
Frames can get expensive. If you can't afford to buy such gold frames etc. Then spray them with a good gold/silver metallic color, a glossy or matte black. The wood color might be hard to pull off. This is what I do. If you want them glossier, get a clear gloss spray.
Place the frames on paper and just spray and let dry. It's so easy. Or go to a goodwill or salvation store, and you just might find some good wooden frames for less than half the price! I have found frames from pottery barn in these places for $3 dollars.
You can try different sizes together or same sizes. It doesn't have to be perfect. Go through some pages in the architectural digest magazine, and you'll notice how some elegant homes have different sizes shapes, pictures etc.
If your looking for a theme, then that's different. For ex: if you want a nature theme at first, then frame just those scenes. If you feel like you need a pick me up, then choose pictures of happy colorful times, places etc. Find pictures of every color in a flower: red, orange, yellow, green, blue, purple, black etc. Frame each flower and you've got color!
Why don't you get some stencils in a variation of different styles, or pick your favorite and stencil either the bottom or top part of you walls, all around or maybe on the wall behind your bed. Circles within sqaures, squares with in circles, lines within lines, the half moon with sun, same colored flowers in a line. You can get stencils at a craft store.
Try going to a half price/used book store and buy some books on clearance, that have some pictures you like and get them copied. I do this. The other day I found a book for $1, called "Shakespears Flowers". I'm going to frame some.
You could go to a hobby lobby store and add some metal cast iron objects on your wall. Some are made for outside, but they look elegant inside. I've baught some cast iron candle holders for the wall and a very large detailed cast iron cross.
I too am also repainting, but I'm doing one wall red in the living room and a stone brick color on the rest. In my room, I've always used so much color, but now I'm going all pure white with green as primary, blue on botton red on top and a lavendar line, on the wall behind my bed. Well, maybe I shouldn't use the blue. I baught some pink satin sheets, and I'm going to use a white feather down comforter and brown comforter with pink and red pillow cases in feather down pillows. Maybe with a touch of my two yellow pillow cases with flowers on them. I basicallly, want my bed as the focal point, it's where I sleep. The other room I use for my cloths etc.
Once you have your collections together, don't stop collecting. Whenever your in the mood or find a nice picture in a magazine, book etc. tear it out or go get it printed. As we change, so does our environment. I can't imagine living in a home for 10 years with the same old colors and pictures. That can be quite stale!
You could also purchase a big binder, and those plastic protector sheets, where you can insert all your photos to keep them organized and labeled. So when you want to change the mood, just go to the binder. You can do this with paint chips, fabric too, or ideas you get from magazines. I working on this now. For the larger photos, go to a craft store and see what they have to protect them.
Well I hoped my suggestions helped.