Take a wide piece and put a witness mark across the face
then rip it into 1/2" strips. Take every other strip and
cross cut it at 2", 5", 7" and 10" (lengths made up to make
the point/use whatever you like) and save the short lengths.
Take it all and re-glue for width using the witness
mark/aligning the grain. Plane, sand and finish to suit.

Or,

Rout grooves but be warned, tear out is inevitable. You can
rout the face half way through and flip it and rout the
other half from th back. This way there should be enough
meat on the face to prevent tear out and who cares what the
back looks like.

UA100