squishys are just fun things, it can be something someone has mentioned needing or a complete surprise. The call is yours and the mood you are in at the time. It can be an exchange between 2 people or... a send to a person and that person pays it forward to someone else. If you are wanting one back in exchange make that clear up front. They are just fun things to get instead of bills all the time. What you put in a surprise one is totally your call.
Just have fun with it :D