In Blues, many endings are similar to turnarounds, except that they finish on chord I rather than 5 because they are not leading into a new verse. It is a good idea to learn some stock endings to fall back on in case you are uncertain what to play for the ending of any particular song. Here are a few ideas to get you started. The first one is in the key of A.
Here’s one in the key of C.
This one is in the key of E.