Yes, some you can tell by looking at the quilt or pattern picture. Some it is a pretty sure bet, and others can easily go either way.
Patterns by certain designers known only for PP :wink:
An example would be animals that are intricately pieced, with very small, teeny pieces. Blocks with a lot of long and narrow spikes.
The more PP'ing you look at or do, the easier it is to spot :D:D:D