These are a great idea as favours or little treats for dessert tables. I definitely recommend the Fresh As (http://fresh-as.com/) fruit powders as they add a beautiful natural flavour. Alternatively you could use different flavoured essence.
3 large egg whites
pinch of salt
100 gms caster sugar
100gms of icing sugar
3 flavours of fruit powder (I used Raspberry, Strawberry and Passionfruit as this is what I had a home), and 3 colours of gel food colouring.
Preheat the oven to 100 degrees
Ensure your mixing bowl is clean from dirt or grease (whip it out with vinegar to be sure) Place the egg whites in the blender with a pinch of salt and whisk until soft peaks form, slowly add the caster sugar until smooth stiff peaks form. Fold in the icing sugar, and split the mixture into 3 bowls. Sift in 1/4 cup of fruit flavouring into each bowl (one bowl for each flavour) and add a little gel colour. Fold until the fruit powder is mixed, and the desired colour is reached.
Pour each into a separate piping bag, and use different nozzles (or the same if you like) Pipe onto a lined baking tray
Bake the meringues in the preheated oven until dry (around 2-3 hours, or until you can take one off the tray without leaving a footprint)