Blobmaker - Create organic svg shapes in just a few seconds
Placemat - Pretty nice placeholder images.
Blobbb Fun - Blobbb is the fun new way for designers and developers to create their blob-like shapes SVG online.
Fill Murray - Custom-sized placeholder images of Bill Murray
Boxy SVG - Boxy SVG is a vector graphic editor built for the modern web.
PlaceKitten - Dead-easy placeholder images. Of kittens.