Thanks! What's next ? I have some ideas:
First replace the 5mm LED in the hollow spider head with two 3mm LEDS (or smaller) directly in the eyes. I think the eyes will glow more clearly.
Then use a servo and more distance sensors, so that the spider turns in direction of a colleague passing by ]:). I wanted this first do with a velociraptor head, and if I find an adequate on, I will do it.
An own shield with a row of LEDs. The sketch is ready and works for LEDs on my breadboard.
Then I want to connect an Arduino with my RP6 robot, perhaps with Wifi or bluetooth.
And in the farther future: a LED cube, something like these interactive lightflowers by ullala, a weather station, ...
And additionally I have to earn some money for life 
best regards
Andreas