Agree with Curly
"There is no one better way as blank making involves so many types"
I have used (and still do) single blanks, slabs, tubes right down to tube in blanks.
They all have different uses and drawbacks / benefits.
For hybrids I always make a slab, depending on the colours and style of blank it could be individual or slab
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Slabs a great for making a batch of similar colour blanks, though the patterns can vary so much even in a single slab.
Single blanks are unique and always a one off - same with tube blanks.
Picture blanks are always tube in blank.
Just experiment, you will find the best option for yourself, good luck 
