Where to find Twitter profile pics?

Is there a good downloadable source anywhere so I don't have to keep using the TA default ones?

I did a google images search for "girl next door", put the setting on icon and just started right clicking and saving in a folder....that way you can be truly different from all the other TA'ers out there

Is "icon" the right dimensions for twitter pics?

I use
for niche pictures, not after opening because they are marked but thumbnails, just dragging them into folder, fantastic resources, small and easy to upload. Renaming them with mass renamer software, of course.
Currently doing projects for one restaurant and one computer service and store, instead of faces and people on pictures I have food, plates and dishes with nice food, and computers, computer parts etc.