Hello. I'm new to microstock and am interested in 'dabbling' in it, try it out to see what I can do with it. Problem is, yes I can do photography, but my biggest thrill is experimenting with images and designs in GIMP/Photoshop. A few examples can be seen here: http://rensiknosaj.deviantart.com/gallery

The ones I wish to point out are the ones labeled BT with a number.

First off, would those(and similar) be worth trying as microstock? Second, I'm wondering which company to try to start with. Earlier posts suggest Dreamstime, but I'm all too unfamiliar...