placeholder.pics - Lightest way to include placeholder images in your design
H A N D Z - Free 3D illustrations of diverse hands gestures
PlaceKitten - Dead-easy placeholder images. Of kittens.
Characterz - Biggest diverse mix and match 3D illustration library
Fill Murray - Custom-sized placeholder images of Bill Murray
Khagwal 3D Illustration Library - Free 3D illustration library for web & mobile app designers