Placemat

Here's how to use it

The three current endpoints are https://placem.at/people, https://placem.at/places, and https://placem.at/things. Any one of those will actually give you a valid image back on its own, but you probably want to do something a little bit fancier. The good news is that all three endpoints accept the same parameters, so there's not too much to remember. Everything is controlled via a few simple query string parameters:

Width w https://placem.at/people?w=500: Specifies the width of the returned image. Can be used alone, or alongside h. A number in pixels.
Height h https://placem.at/places?h=400: Specifies the height of the returned image. Can be used alone, or alongside w. A number in pixels.
Random random https://placem.at/things?w=250&random=some_seed: By default, Placemat will always return the same image for a given size. If you want to mix things up a bit, pass random=1. If you want to get the same "random" image every time, pass any other value for random, e.g. random=hello or random=2. This tends to be especially handy for the /people endpoint.
Text txt https://placem.at/people?txt=Hello+World: Placemat will add your requested dimensions to the returned image by default, but you can bypass that by passing txt=0. If you want to display custom text, just send along something like txt=Hello+World!
Text Color txtclr https://placem.at/places?txt=Hello+World&txtclr=f00: Change the displayed text color. Accepts a 3 (RGB), 4 (ARGB), 6 (RRGGBB), or 8 digit (AARRGGBB) hexadecimal value. The first two digits of an 8 digit hex value represent the color's alpha transparency. Defaults to BFFF.
Overlay Color overlay_color https://placem.at/things?overlay_color=0f0: Defines a custom overlay color. Accepts a 3 (RGB), 6 (RRGGBB) or 8 digit (AARRGGBB) hexidecimal value. The first two digits of an 8 digit hex value represent the color's alpha transparency. Defaults to ACACAC
Overlay Blend Mode overlay_blend https://placem.at/places?overlay_blend=difference: Allows changing the overlay's blend mode. Defaults to multiply, and can be assigned to any of the imgix blend modes.