Keep Tabs on Your Gels
Rui is using a flash-head-sized template to cut the sample gels that are available for free from Rosco.
(The samples can be hard to find, tho. Always ask when you place an photo gear order somewhere.)
Rather than extend them with tape and mount them with velcro or rubber bands, Rui trims them in a way that leaves a small tab that fits in the built-in bounce card slot. Creased properly, they should pretty well stay put.
This seems like a pretty clean way to mount your gels if your flash has a built-in bounce card, as many do. You can see bigger pix here.