Well… i just wanted to share with you. Its a good place to speed up your workflow and learn. If you’re working with team you basically wait for your designer or artist to complete your 2d sprite character, props, effects. Until then you’ll end up seeing boring character or env’ props. So you don’t need to. Just place one of them or use as template to create your own sprite… There is a tons of stuff you can download and use. But its not commercially allowed. soo… yeah.
Here you can also download some free sprites: ://www.blendswap/blends/view/65505 
woa thank you!
://opengameart.org/ (make sure to check the license / attribution requirements on any art you want to use, as it contains content under various licenses) and ://kenney.nl/ (all CC0) are two good places to check out as well.
Cheers,
Michael Noland