Surely creating them from a simple microcontroller will be impossible! Not according to [techtoys], who has created an Arduino shield that creates an HDMI output from an SPI control input.

[Mike] sent in a project he’s been working on – a port of a BASIC interpreter that fits on an Arduino. The code is meant to be a faithful port of Tiny BASIC for the 68000, and true to T… ...

Check out the this colourful but BASIC use of Arduino, flagged in the "Tweets of the Week" section of the magazine, but it's worth highlighting in a bit more detail.