Espruino Pico 'adaptor pack'?

I'm thinking of making a kit of common 'shim's - so that you could buy it relatively cheaply ($10?) and get a whole load of little PCBs that would allow you to connect your Pico to different hardware really quickly. I think it's something that might be pretty helpful?

But what kind of things would you generally want? There are already a load of adaptors designed for the Pico - but which selection would be good?

I'm thinking:

• ESP8266 WiFi
  
• HC-05 Bluetooth
  
• RFM69/RFM12B wireless
  
• A small prototype area + mounting holes
  
• Arduino adaptor
  
• WIZnet ethernet
  
• XBee footprint
  
• A solder-on 0.05 to 0.1 inch adaptor so you can get at the end pins easily
  
  

Also how would they connect? The ones like the ESP8266 shim are really tiny and make a very compact package, but you have to solder them straight to your Pico. Possibly something that just connected on 0.1" and that you could solder header pins onto would be better.