A great way to practice and sharpen your computer skills is to experiment with combining photographs, which are called photomontages. You can achieve very interesting surreal effects with this process and it's great fun to see what you can come up with.
FLOATING ORANGE PEPPER
BAGEL IN HALLWAY
I have created many images of this type which have been exhibited in galleries and art centers. They are limited edition prints, printed on archival paper using pigmented inks.