Some flytraps seem to colour up more than others, but they do
take a LOT of direct sun to colour up. I don't recommend exposing
even a partially sealed container to direct sun because the temp.
inside can rise quickly, and toast your plant. Fly traps however
can be grown outside in many environments. They will even survive
frosts, coming back from the underground part, if it's deep enough
and the frost light enough (you can also mulch the plant to keep
it from getting frostbit).
Personally I think my plants do better when they are exposed to
cooler temps & shorter days and go dormant in the winter. Even
plants need a rest sometimes.
Flytraps do attract bugs, both with the colour and the nectar
secretions of plants grown in the sun. They also catch crawling
bugs that come out at night. Flytraps never sleep :-). I still
find flytraps one of the most interesting plants around. Many
CP growers get innured to the "common flytrap", but growing them
hale & healthy year after year is quite a challenge.
R.