I couldn't find anything I could use for standing up a pegboard on a desk or table that wasn't meant for an Ikea board, so I came up with these.

My specific pegboard, screws and nuts were all bought off Amazon:

• WALMANN 4-Pack 12"x16" Metal Pegboard Panels for Garage, Tool Organizer Pegboard for Pegboard Hooks - Compatible with 1/8" & 1/4" Hooks (Black)
• uxcell M6x15mm Male Thread Phillips Flat Head Bolt Screws
• M6 x 1mm Thread 304 Stainless Steel Serrated Flange Metric Hex Lock Nuts

There are five parts that you can use to orient the boards in a number of ways:

1. peg_bridge - connects the tops of two pegboards together.
2. peg_bridge_corner - connects the tops of two pegboards together in a corner.
3. bracket - this is a single wide foot meant to support the bottom of the last board, can use a double bracket if you want extra sturdiness.
4. bracketx2 - this is a double wide foot meant to support/connect two pegboards together on the bottom.
5. bracket_corner - this is a double wide foot meant to connect/support two pegboards in a corner.

The corners were easier to fasten by putting the screws from the back - the tolerances are quite tight coming in from the front for all these parts.