Holes in clothes- monster mouths!

So because Eli isn't walking yet all his pants have these delightful little tears in the knees of them (don't talk to me about his shoes!) and I can't keep throwing them out because they still fit him and seems such a waste. Today I had a quiet moment and decided to try and fill it in (saw on pinterest of course) but I didn't have proper scraps or any inclination to sow...

Monster knees!!The teeth were from an old cot blanket that frayed so I would use something else next time and I used maybe 4/5 layers on the mouth so it wouldn't wear away so quickly. I can see alot of monster themed clothes coming up :)