Replying to How to Get in a Creative Mood?

So I make my own t-shirts and hoodies as a hobby and sell them to friends. No, I'm not another NS kid trying to get his t-shirt brand bumping on here, I'm just a bit in need of design/art ideas. How do I get into the mindset of creating sick logos/art? And no, I will not do any drugs or anything to alter my state of mind haha. The stuff I make, I guess you could relate to Yoke Collections style of stuff, kinda skiing/streetwear stuff.