There were several people making some compact VGA test pattern generator units but every one I've checked has stopped production. Has to be digital now (HDMI, DVI or SDI) or it just ain't cool enough. This is about the closest I find, WELCOM TO AVLINK or VGA Pattern Generator - PG-VGA - Shop now - Black Box, and they're around $285 to $300. For that cost you could probably also get a used laptop and run some pattern generating software.