My paper pauper cube, originally hosted on Cube Tutor.

To an extent this is a collection of pauper 'good stuff', but there are some specific themes and archetypes supported, to varying degrees. Each colour pair is intended to be viable regardless of whether it is tightly archetypal.

I will only include cards that have modern-framed black-bordered paper printings at common. No Un-sets / silver borders / silver symbols.

Thoughts and feedback very much appreciated!

Archetypes:
Black devotion,
Simic, GUx and Gx ramp
Azorius flicker
Esper control
Boros go-wide aggro
Selesnya auras
Gruul stompy aggro
Izzet spellslinger
Rakdos aristocrats
Golgari graveyard midrange

Black alone has a large number of single-colour payoffs. Black typically plays as an 80 or 20% colour in the cube, either the dominant colour in a Bx deck, or a splash for the cards that fall outside this archetype. It doesn't work as a 50-50 colour as much as the others do.

Gary is the best devotion payoff, but there are a number of smaller ones. All the other common devotion cards are ok but not at his level. There are a number of cards with double black pips, which reward heavy black in deck construction even if they are not so obvious as Gary.

If you want to ramp you go green. Not really a surprise, but there is a conscious decision not to include the signets for example, which allow ramp anywhere. Green is also the best base for 3+ colour decks. GU is a classic base more than the other colours, making GUx (most often splashing for removal) quite viable.

ETB effects make very strong creatures, and come in all colours, particularly Esper. But while black may have some good ETBs too, the synergy flicker cards themselves are in Azorius.

Azorius has a blink archetype. Dimir and Orzhov have no specific mechanical theme, but both tend to play with a similar control style. Value creatures (often still with ETB effects) and efficient removal is a good combination.

Aggro is found in Naya colours in this cube, rather than Mardu which is the other common option. Boros is your traditional go-wide aggro, with tokens and team pumps, and is generally the fastest colour pair.

A smattering of green hexproof creatures and some really strong auras in both green and white allow what would otherwise be far too dangerous a plan in terms of card disadvantage. Pacifism effects are great removal too. This tends to be an aggressive strategy, and Selesnya can do a good Boros impression with cards like Sigil Blessing and Scion of the Wild.

Gruul can do go-wide too, though it's closer to midrange stompy as the Gruul and green sections don't have team-wide pumps.

Some cards which care about instants and sorceries, combined with the generally strong instant suite in blue and red. No Young Pyromancer at common unfortunately, but still a classic.

Value in death, another classic archetype. The red token makers fit here as well as Boros aggro, creating multiple bodies as they do. A good balance is required between sacrifice targets and the aristocrats & payoff cards, but when it comes together it can be very effective.

There are a few cards in green (Young Wolf, Bayou Groff, Golgari Rotwurm) which complement the sacrifice archetypal cards, making Jund the natural 3-colour extension of Rakdos. Golgari generally plays with value-based sacrifice/recursion effects, it is a much slower deck than Rakdos and is not what you would call aristocrats, despite the overlap.