Unfortunately, two of your photos are so out of focus we cannot see any insects at all. The blue photo is too far away from the white specks for any kind of insect identification.
You should have some success identifying your "insects" by looking at the color photos in our Diagnostics under the category of Pest Control. There are many indoor pests there.
There are also many things which will mimic the sensation of insect bites and you should also eliminate these possibilities. Here are two publications which may prove helpful to you if you are worried about that.
This is a good basic one:
This one adds to that: http://www.ext.colostate.edu/pubs/insect/bug_bites.htm