Transform old bottles or use new ones and paint them a beautiful shade of green. We made the lime-green colour by blending green and yellow glass paint. The bottles should be completely clean and dry before you start painting; avoid fingerprints. For the most even results on smooth glass surfaces, use a broad, flat acrylic brush with soft bristles. If you like, dilute the glass paint for a thinner consistency. It doesn't matter if a few drops drip down the bottle; it's supposed to look hand-painted. Think of the expression "imperfect is perfect". For glass that does not have a smooth surface, it may be easiest to use undiluted paint and to apply it thoroughly with a brush instead. Let dry for 24 hours; if you want the paint to be permanent, then harden in the oven at 160°C for 40 minutes. Then let the bottles cool in the oven with the door open.