After trying clip-type barrettes, funky-shaped wire paper clips, and stick pins...
I now use the larger-sized plastic/vinyl coated paper clips on my boards. I've been very pleased with them.
They are stupid cheap too.
I buy mine at Dollar Tree - nice sized box for $1.
Large-sized paperclips used at both ends to hold fabric on my Easy Core Boards.
[ATTACH=CONFIG]248879[/ATTACH]