Use colors (theme) instead of black-white

[phuocng]

Thanks Kudo Rei for the feedback:

One thing if I'm forced to say, I'd say this black/white collection doesn't look fascinating for me to see. would be better with colors for me

[piranna]

Gray colors are used on UI when designing the layout just in purposse to don't get biased due to specific colors... On the other hand, having theme support and some colored examples would be nice but just only for demo purposses, for the general showcase I would stick with black-white-gray colors.