feeling a bit creative, and want an actual outlet for it? something physical, tangible, that you have [partly] designed yourself? head over to nike id, where you can fully customise [colour-wise, at least] a wide range of footwear, apparel and accessories.
you can keep it quite basic [like the top image], go for something a bit colourful [above] or go all out [below]!
they have a wide range of products to customise, from shoes to football boots to bags to tshirts, and they don't cost that much more than you would pay for the pre-chosen colours in the shops.
even if you aren't planning to buy, it can be fun to play around anyway. the site is simple and easy to use, so give it a try!
link to nike id