Something that gives people just enough metal to get a feel, without a massive up-front expense.
The old intel atom c2550 | c2750 (rangeley) series were ideal for getting people familiar with cloud metal, bgp etc, and all the awesome things packet/equinix brings to the table, but without the high price point of the larger servers.
I don't know if this is possible, but we still hang onto our reserved ones, they're perfect little puppies.