Very nice Olivér, but actually the concept was presented earlier than 2004.
Already in 1993, Jacques Haubrich investigated whether the 24 different Tangle cards could form a matching solution onto a cube.
This indeed appeared to be possible.
Moreover, there appears to be only one solution!!
Jacques explained his findings in an article of the NKC-magazine Cubism For Fun (CFF-issue 31, page 18, June 1993).
As Jacques also explained, the same pattern appears on all sides of the cube (of course in different colours).
Each colour appears in 4 separate strings.
Jacques called his invention "Cubik’s Tangle".
For a collector of "twisty" puzzles, the obvious next step after realising this was to put the cards onto a 2*2*2 cube.
I did so in 2002 by scanning the cards and printing them to the size to fit a regular 2*2*2 cube of 40 mm.
The result was shown at the DCD in 2002 in Leiden as well as here at twisty, see:viewtopic.php?f=1&t=1141
Jaap also presented the pattern at his puzzle website, see:http://www.jaapsch.net/puzzles/tangle.htm
Regarding availability of the stickers, why don’t you just ask Erno Rubik whether he will allow you to sell such stickers (he just might)?