Summer/spring footwear for the knee high boots girls?!

I'm absolutely in love with leather knee high boots, esp with square toes and platforms! I do have a regular pair of boots i wear daily atm but as it gets warmer they'll be more uncomfortable.

Anyone else love knee high boots, what do you wear in warmer weather? I also like those chunky 90's style sandals. Not really a fan of trainers or anything.

(If it helps, im 31 so i try not to dress like a teen but I'm a big fan of more "grown up" y2k styles)