The glass roof on every Tesla car should be adjustable to three modes: fully transparent (viewing starry night), fully silver (deflect sun light in hot days), fully black (absorb sun light in cold days to warm cabin).
The car console can have a triangle-shaped UI to represent the three extremes, and let user select any point inside the triangle to tune the color of the glass.
Robotic vacuum should be the next little thing that Tesla makes and sells.
Can play out the full advantage of the huge charging cycle abilities of Tesla battery tech, e.g. 4680. If i run the vacuum twice daily, for two years, that will be close to 1,500 cycles. Batteries of most robot vacuums never survive that many cycles.
in addition: electric motors (tiny), metal construction body (compared to flimsy plastic bodies of vacuums on market), running on wheels (also tiny), auto sensing -- all the reason for Tesla to spare some time on this and disrupt the market.
