bright and cheerful
Catkins are the flowers of a willow.
Like a yellow jacket hole.
they look mostly yellow and have black dots here and there
yellow
The flowers of a willow tree are called catkins. There is no standard collective noun for catkins, but based on their natural formation you could use the collective noun a cluster of catkins.
nothing
It looks like a monitor. Also, it has yellow spots on it.
Well, I'm not sure, but I think they look like...yellow roses with red tips. :)
they are yellow
It is a yellow pill
Yellow stuff