Premade BG's, Pngs , and MorePremades are great, you can just slap a few things on top and BAM you have a master pieceMore Like This
Premades can be a curse too. Not only do you have to make sure all premades contain credits (they can contain copyrighted images) You need to make sure they fit the lighting on the art you are creating. For the purpose of this group I encourage you to make your own. You are an artists aren't you. creating a bg is fun and really can add so much to your art because you can place things where you want them, to the left or right of your image. Try making your own for all of our exercises.
All pngs are just way to easy to use. No cutting needed and you can find one for what ever you need. Hell you can even create art using nothing but pngs... kinda like a cut and paste artist. When using png you must also make sure they are cut from legitimate stock, many are cut from copyrighted material which is a no no to deviantART and most groups.
Groups are getting real picky about the art they are accept