creating thumbnails

Does anyone have any tips on creating great thumbnails? I like what the thumbnails on my channel look like but I feel like there is always room for improvement.

So me personally I enjoy making the thumbnail more than creating the video! I spend so much time in them and that's not necessarly editing them it's thinking of weird and wacky ways to just make them look hilarious or I hope they are. I try to make them as eye catching as possible and the way I...

Can anyone help me out with a good tutorial for making quality thumbnails and maybe a free program to do it on. Thanks so much!