I so love feeding the wild birds, and have made this a number of times..the birds love it. Makes a nice, firm, long lasting seed treat. It works well if it's formed in a disposable, flat, plastic food storage container (or use whatever container you have for chilling in) and then placed in a tight fitting mesh onion bag for hanging. I can often find a container the same size as my wire suet feeders, which works great also. I coat inside of desired container with a little shortening or oil before filling for easier removal.
Stir two (1/4 oz. ea) envelopes of unflavored gelatin (into 1/4 C. of water in saucepan.
Stir over low heat until gelatin is completely dissolved and water is clear.
Stir in about 1-1/4 to 1-1/2 C of any combo of seeds you like (I often substitute oatmeal or/or cornmeal to the mix).
Mix well so all is coated with liquid gelatin.
Pack mixture firmly into container and chill until solid. Remove and set out for birds to enjoy
(21 degrees predicted overnight here in the deep south..as a transplanted Yankee girl, love a change to colder weather <short term, mind you!> and a chance to get a blazer going in the fireplace

)
Dee