What is some cool stuff you can do with a Raspberry Pi 2?

Tor Snowflake proxy. Learn FreeBSD/pf which works great with those specifications. Try to overclock it and see how much you can get away with before failure. SSH honeypot. Low-spec server for a simple site. If you have bandwidth, you could contribute some to SyncThing by hosting a public relay.

Uh, won't that bring the FBI to my house?
- Not necessarily. You might be confusing it with a Tor exit node.
  The Snowflake project provides people who live under an oppressive regime the ability to connect to the Tor network. You can’t observe their traffic and you are not an exit to the open Internet. Generally, you shouldn’t be able to connect the activities of any user with traffic on an exit relay.

Setup a DIY display using the display connector and use it for a custom network connected display to show whatever you want. Tons of language options to pick from.

Wrong question really. The better abstracted question is what class of hardware is comparable?

It is faster than most routers, so anything along those lines. I like to look at what people have made with a Beagle Bone. That TI chip is a router class chip. Most projects that use a BB have a better intelligence and motivations filter compared to much of what pops up with a Rπ.

Look and see if there are any OpenWRT images for it. The Rπ foundation stuff is super bloated by comparison. Most OpenWRT images are 8-32 megabytes. You start out with an ultra stripped down POSIX system, but OpenWRT has a built in package manager and all your typical packages needed to expand into a more regular Linux desktop user like experience. If there is an image for the board, you go from underpowered to overpowered monster for the OS image and overhead. It can be a fun challenge just to learn the lower level terminal commands when stuff like compgen is missing and you don't even know all your commands. You also don't have manpage docs and help is rare and sparse too. That was my catalyst for really learning grep at a more useful level.

Wrong question really. The better abstracted question is what class of hardware is comparable?
What is this, Stack Overflow?
- I've never engaged on stack overflow, only used whatever thing I've skimmed.
  Is there something I said that triggered or offended you in some way worth mentioning and calling specific attention to?
What's your strategy for finding terminal commands in the situation you mentioned; no compgen and little available documentation?
- Not at my computer with my scripts, but you can grab the path variable and loop over each entry with ls. I often end up brute forcing this and piping it to /tmp/delete then I can just grep the file. First thing I do is add bash if possible.

If it’s windy you can use it to keep your papers from blowing away.

It's not nearly heavy enough.