I have seen lamps made using gallon bottles and here are some other ideas
Turn them into Lamps using a conversion kit from craft stores. You could colour them by pouring paint inside a swirling them, or fill with pebbles or glass beads or marbles or windscreen glass etc. You could make into terrarium for plants. Have fun........
I upcycled a glass gallon jug that I'd love to share - https://chascrazycreations.com/fireflies-and-cattails-2/
How about a terrarium
Terrarium, lamp, fill with twinkle lights (battery) and place outside or on steps when the weather is nice, spray paint and add some faux or fresh flowers for a centerpiece or accent
You may be able to make them into some fun solar lights.
Cut the top off, smooth the edge, voila, vase or bowl :)
things to use or make using pill bottles
I have tote that is broken but it seems a like a shame to just throw it away. Any ideas?