1. Get some friends who are Lovecraft fans around.
2. Roll out balls of plasticine (kid's colour play-clay) into the various colours.
3. Set out some children's wooden building blocks to represent an alien city (like R'lyeh, Leng or Irem) on a large table, e.g. monoliths, arches, strange angles, circle henges and ziggurats.
4. The Players take an equal amount of each colour to shape Teeth, Chaos, Eyes, Tentacles, Legs for each 'Giant' G.'.O.'.O.'. monster. Think of it as a crude, low-tech Monster Construction Kit.
5. Using a freeform variation on the rules of Games Workshop's Adeptus Titanicus or FASA's Battle Tech,[or best of all, Inner City Games Design's Fuzzy Heroes - John] make an monster-mash system, so that combat, 'magic powers', movement turns and line-of-sight are made fair and playable for each G.'.O.'.O.'.. In other words, get all the player to agree on the way the luck is moderated via the dice/cards (tarot?). Just make it very very simple so it's a lot of fun, and people will play again and again.
Different colours = different power ratings?
R O Y G B
I V power-ups, e.g. an eye made out of red plasticine can have a small
laser-blast, a yellow claw is extra-strong, a green tentacle can dissolve whatever it
touches etc. Make up appropriate character sheets.
Space Chess!
Remember that game Chewie and R2D2 play in Star Wars?
Colours = Kalas!
Make up psychedelic Magickal Qabalistic power variations on your G.'.O.'.O.'.s,
e.g. Kalas (777 listed in columns XV,XVI,XVII,XVIII), Shaktis
and Ojas (Theojas, or God-energies) ejaculated by sexual radioactive alien
entities. As Digits of Time or Lunar Fluids, when converted into
fundamental magical energy, kalas could power spacecrafts, astral
projection, and magical machines. In Aiwass Physics each colour has a
corresponding vibration that may be magically radioactivised. Colour
implies space and space implies levels of consciousness so in the
Gnostic Universe each colour is a communicator. Colour combined with
space produces psychic energy, etc., etc.
Statistics:
Why not make all the classic Great Old Ones in
the Call of Cthulhu rulebook and have them beat the shit out
of each other. The referee can then use that easy rules system!
Modelling:
Why not include other material in making
your G.'.O.'.O.'.? E.g. cigarettes, nail clipplings, toys, hair, microchips, menses,
glow-in-the-dark slime, wax, GI Joe guns, hieroglyphs, coins, crystals,
aircraft models, semen, melted plastic etc..
Karmas
Use Austin Osman Spare's system of 'Karmas' to
construct your G.'.O.'.O.'.. Take a sheet of paper and begin to do an 'automatic
drawing', scribbling continuous twisting and interlacing lines. When the mind
is oblivious to what the hand is drawing, great success is assured. 'From
this mass of procreative shapes, full of fallacy, a feeble embryo of
idea may be selected and trained by the artist to full growth and
power.' Then construct your 'Dweller on the Threshold of the
sub-conscious' from what you can see in your drawing out of the
plasticine.
The game usually tends to degenerate after 30 minutes into a Stop-Motion Animation game, with players moving their G.'.O.'.O.'.s along regardless of 'turns', and hitting each other in real-time. When this starts, get out your camera and snap some 'action shots' for some unspeakable photographs. Extend this to a video camcorder, and make your own SFX film!