This is my first collection of "recipes": GRC Cook Book.pdf. It has 11 entries titled:

1) Turn a stream on or off from the GUI

2) Multiplex or demultiplex signals

3) Match dissimilar sample rates

4) Shift the frequency of a signal without re-sampling or filtering

5) Match the period of a digital symbol to a desired time period

6) Stream data over a network

7) Divide a section of bandwidth into multiple channels

8) Call functions in a block

9) Retrieve the baseband signal from an RF signal

10) Convert a stream of bytes into a stream of bytes with values 0 or 1

11) Prepare a stream of bytes for the Frequency Mod block