no problem at all! everything i use is just f2u assets ive found on dA over the years, but a lot of them are actually sprite rips from games ^_^
i think most of them actually come from this specific page, forgandal, they have a bunch uploaded and its easy to find more pixels like them if you look in the “suggested collections” tab off to the side.

heres a handful of other favicon + graphics resources i have saved as well ! forestcake + oceancake / pixelsafari / gifcity