Flexible Silicone Neon-Like LED Strip - 1 Meter [Pink] : ID 3862 : $13.95 : Adafruit Industries, Unique & fun DIY electronics and kits

They look a lot like neon, but without the need for expensive transformers, glass tubing or inert gasses. Super flexible and bendy, they feature a single-color non-addressable LED strip with a solid chunk of translucent silicone rubber as a diffuser.

adafruit-Flexible Silicone Neon-like LED Strip - 1 Meter

Flexible Silicone Neon-Like LED Strip - 1 Meter [Cold White] : ID 3865 : $13.95 : Adafruit Industries, Unique & fun DIY electronics and kits

Flexible Silicone Neon-Like LED Strip - 1 Meter [Green] : ID 3868 : $13.95 : Adafruit Industries, Unique & fun DIY electronics and kits

adafruit-Flexible Silicone Neon-like LED Strip - 1 Meter

Flexible Silicone Neon-Like LED Strip - 1 Meter [Red] : ID 3860 : $13.95 : Adafruit Industries, Unique & fun DIY electronics and kits

Flexible Silicone Neon-Like LED Strip - 1 Meter [Blue] : ID 3867 : $13.95 : Adafruit Industries, Unique & fun DIY electronics and kits

NeoPixel RGB Neon-like LED Flex Strip with Silicone Tube [1 meter] : ID 3869 : $34.95 : Adafruit Industries, Unique & fun DIY electronics and kits

Flexible Silicone Neon-like Skinny NeoPixel LED Strip [96 LEDs per meter - 1m long] : ID 4310 : $34.95 : Adafruit Industries, Unique & fun DIY electronics and kits