These are some of my entries to the C64 "lines" size optimization contest.

x34 won!

x33 and x32 where written after the contest and use Geir's BASIC vector trick.
x29 and x28 are tweaked versions of Petri's 31 byte entry.

See:

https://twitter.com/nurpax/status/1159192477598965766
https://gist.github.com/nurpax/96285c08710387e73ea5e039e27980af

Basically, create a C64 PRG file that draws a light blue cross on the screen
with a black background and border in as few bytes as possible. Some terrible
things where done to reduce the size of the binaries, please don't expect
quality code here :)

-Phil