Cut a slit in your empty toilet paper rolls and slip them over rolls of wrapping paper to keep everything nice and neat. You can use a piece of tape to make it smaller for thinner rolls, and it keeps the paper from getting all messed up!
If you'd like to make your own flower, all you need is toilet paper rolls (or paper towel rolls) and craft glue. Flatten the rolls, cut into bands (a toilet paper roll should give you about four circles). Pop them out a bit so that you have a flower petal shape, and glue together on a flat surface, in any pattern you desire! Leave plain or spray paint.
Wrap a piece of Glad Press'n Seal around your wrapping paper roll to keep it from unrolling. It comes off cleanly, is reusable, and doesn't damage the paper like tape or rubber bands.