Use the colour wheel as the basis for a single colourfull illuration that could be tessellated across the wrapping paper? color theory chart - beautifully simply way to learn this (plus the fact that I suck at combining colors LOL!
The creator of this chart is the artist Cate Edwards. As Anna Funder (author of 'All that i am) says. Finding your creativity is like approaching al cat in a room, you have to let the cat come to you. The main thing is that you have to be in the room.