I've been using the tasks module for awhile, and never really realized what the tiny spec was next to the text of my open application. After trying to use the "icon-only" setting, I realized they were icons! Unfortunately, on my shelf (about 28px high), they appear incredibly tiny (SS attached).
I'm using the faenza icon themes, which are SVG; appropriate loaders are built + in use via evas_generic_loaders, and the icon set works really well everywhere else (for example, in the window border shown in the SS).
My system is running fully up-to-date EFL 1.7.3 + dr17-lucky. My specific settings include a panel at 28px, and "enable icon theme for {applications,enlightenment}" are both in use.