You could easily make a dome type cover by measuring your teapot fromspout to handle!
Metal warmers also work with little tea candles inside. The trick here is to never leave this lit for longer than 30 minutes. Also, never use a votive candle - only a mini type tea candle. Never use a tea cozy at the same time as a warmer! It could catch on fire!
This brown porcelain tea warmer below is very nice for your everyday kitchen type teapot!
Taking time for tea is enhanced by all these loving cozies!