What do I wear with mid-calf grey slouchy heeled buckle boots?

I don't ever wear grey and the color feels so strange on my feet. They are a medium grey and the style is similar to these: a href="http://www.monstermarketplace.com/cruelty-free-leather-alternatives/madden-girl-singerr-tan-pleather-slouch-boothttp://www.monstermarketplace.com/cruelty-free-leather-alternatives/madden-girl-singerr-tan-pleather-slouch-boot" rel="nofollow"http://www.monstermarketplace.com/cruelt…/a