Diy Floating Pool Lights . A 20 x 40 pool could be seen with two lights. Diy fountain for aboveground pool. Floating Pool Letters & Lights Decorations for Party Ideas on Foter from foter.com This is such a fun idea to have for your kid’s birthday party, or just a normal night swim in your pool. (it cuts pretty easily and evenly with the knife as opposed to the scissors.) you don’t want them too small or the tea light will show over the top, but if the noodles are too tall they will not float steadily. This is much safer overall and.