Instant coffee finished = empty jar.
Stick on a scattering of star stickers (got mine from the local WHS - a good number for your money).
Spray a thin layer of gold paint over the jar (follow the instructions on the can - please make sure you are in a well ventilated area outside and definitely newspaper down - I learnt from mistakes - ooooops).
Go and have a cup of tea whilst the paint dries.
Spray another layer of paint (also, make sure that you don't spray too close to the jar or the paint will just run and look yukky).
Go and plan your next crafting project.
(I sprayed the jar three times, quite patchy in places, but it's up to you.)
When paint's dry, gently peel off the star stickers, a craft knife (or finger nails) can help. Some of the paint may have run under the stickers but the main shape will be obvious.
Et voila, plonk a candle in and you have a tea-light/candle holder.
(idea - try arranging the stars in constellations)