Ruby/Evas provides Ruby bindings for Evas.

You can read the documentation online here, and it is also included in the distribution.

Here is a screenshot of an Evas demo in action. (Anything possible with an Evas should be possible using Ruby/Evas, though my demos are a bit unimaginative...)

Here is a screenshot of a Ruby/Evas showing some transparent text.

The latest release is 1.0, released 20 June 2002.
Download 1.0.