This is a good list to consider as you create your design/graphics:

6 Photoshop Alternatives for the Casual Designer

Photoshop isnít just an industry standard piece of image manipulation software used by professionals, itís also an application that is sought after by many hobbyists looking to fulfil their creative passion. Unfortunately at $600 dollars itís out of reach for most casual users, so other than pirating (which is bad mmkay), what high quality alternatives are available for the casual designer?