Has anyone ever done a Saggar firing (pottery) and how do you generate some bright colors?

We are doing a saggar firing in about ten days. We are using aluminum foil to enclose the pots and attaching various metals (copper wire) and/or organic materials (leaves, peels, seaweed) to the pots, using an adhesive or tying the items using twine or ripped up sheets.

I want to try to get some bright colors; reds, oranges, blues, if possible.

What would you suggest I use? My two pots going into the firing are about nine to ten inches high so I have room for a couple of attachments. My instructor suggests that we attach no more than four (4) different items so that the piece will not look crowded, assuming that we get decent results.