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!
These sketchbook pages have a formal, organised, uncluttered presentation style, with a minimal use of colour. Items are positioned carefully, allowing each piece of the design process to be appreciated fully.
Textiles and Fashion Design Sketchbooks - 20 Inspirational Examples