these are Kinda funny. My suggestion is that you should draw on blank paper, Unless you don't have anything like that.
I disagree, where is the joke in these? I sort of see it in the last one, but it could use a lot more fleshing out, as it stands it's really hard to figure out what's even going on. The art in all of these is pretty decent, it's just that most of these jokes are really obscure in-jokes.
To solve the whole grid thing, find something with non-photo blue grids (many notebooks have this), then use a non blue channel for the image.
