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You can use these block ids when making custom blocks:
23, 25, 28, 29, 33, 34, 36, 52, 55, 69, 70, 75, 76, 77, 84, 88, 90, 93, 94, 97, 99, 100, 106, 110, 111, 113, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 127, 129, 130, 131, 132, 133, 137, 138, 140, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 172, 174, and 175 through 255.
Hope this helped!
If I made a mistake please let me know!
+1 If you find this useful!

I am also looking for somebody to partner with to make texture packs for my mods, send me a private message if you can.

Very cool

Quote from Firenibbler

You can use these block ids when making custom blocks:
23, 25, 28, 29, 33, 34, 36, 52, 55, 69, 70, 75, 76, 77, 84, 88, 90, 93, 94, 97, 99, 100, 106, 110, 111, 113, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 127, 129, 130, 131, 132, 133, 137, 138, 140, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 172, 174, and 175 through 255.
Hope this helped!
If I made a mistake please let me know!
+1 If you find this useful!

I am also looking for somebody to partner with to make texture packs for my mods, send me a private message if you can.

This is actually very helpful +1
Since I use custom blocks in almost all my mods now I know which ones I can actually use.

If you use pocketinvedditor to spawn in blocks you can only use, like 5 of the data values, the update blocks, glitch stone, glitch grass, and glitch leaves.

Can someone post the free item id slots? That would be useful for some people.

From #500 and up they are free, there is no max I know of.

Quote from Firenibbler

From #500 and up they are free, there is no max I know of.

512 or 513 is the max. Also, do you know how to give one entity another entities properties? Example: I added and Ender Pearl, and I want it to be throwable by giving it properties of a snowball. Got any ideas?