Some of the most popular home-made feeders are done with a test tube or vial with a stopper (red plastic is popular or teflon with a hole, and there are places that sell them) - sometimes even with a little plastic flower in the stopper (they sell these as replacement flowers for the feeding ports on some commercial feeders) and some large gauge copper wire that is then wrapped around the tube. Excess wire at one end is left to hang the tube. Some will then place some red jewelry ornaments (eg., red beads or red tear drop crystals such as those used for bracelets or earrings or necklaces) on the coiled wire. I have seen many cute feeders done this way and the hummers do use them.

It sounds like an interesting idea, but your picture is a bit small (for my eyes anyway) to see the details. How do you keep the birds from gorging on the suet mix? I only fill a couple holes on the suet log each day, and put some crumbles on the tray. I'm not interested in subsidizing the House sparrows and Starlings of the neighborhood. Fortunately there are usually only a few of them that come to the feeders.

I would think so too, except there is definitely a light yellow tint there, similar to a canary. He/she really stands out among the flock of darker sparrows. I've never seen one like it.

I posted at the Birdwatchers forum, it doesn't seem to be as busy as it used to be but then I haven't visited for a long time either. Here are three photos I managed to snap of the mystery sparrow? finch? In this last photo, bird is just to the right of sparrow with out stretched wings: