Despite having a pile of ideas and plans, and of course never enough
time to implement them, I was able to heave out some planned and
requested features for the
Polyomino Tiler.
There are a handful of minor UI improvements, and two major new
features. The first is the ability to specifically assign colors
to certain tiles, as well as expanding the list of provided colors
and allowing for arbitrary colors (in hex format) to be added. That
and the fact that the heptominoes are now also included enable the
following image:

The second new feature is the ability to distinguish between pieces
in a one-sided mode, as well as a fixed mode. By “distinguish”, I mean
both that you can decide to include or exclude a particular variant,
as well as assign variants their own colors (as the following two
images illustrate, respectively).

The above image has the ‘T’ tetromino fixed at one orientation, the
‘S’ tetromino as one-sided, and two fixed variants of the ‘L’
triomino. The image below is all one piece, colored differently
for each of the eight orientations.

Well good.