Take an empty coke bottle and fit it into a balloon. For adding a bit pop to this idea you could also decorate your balloon with beads, studs or design them with markers and glitters- after fitting the coke bottle.
These blue pint mason jars and battery operated cool white LED fairy lights come as a pack of six. When paired with fairy lights, these Limited Edition Ball Heritage Collection Mason Jars make great centerpieces and event pathway lighting.
This website has a TON of cheap decorations, wedding stuff, crafts, etc. Catering you dessert section in all blue sweets is a great way to include your wedding theme colour of blue into your food choices!