Green, black avatar
Blue, white signature
Finally the black and white website interface with that pirate logo.
Dark green/black is perhaps not the most noticeable combination, I hope that the current contest
Sinbad.io Mix Your BTC Quickly AVATAR contest | Win up to $200 will bring some improvements when we talk about the avatar.
The signature looks pretty good now (at least to me), I wouldn't change much.
You can use yellow instead. Yellow color harmonizes well with blue and green.
Yellow colour for a service such as a mixer is completely unacceptable. Otherwise, in web design, the combination of colors is very important, depending on the activity for which it is being made. I suggest that you do a little research, you will see that yellow is more suitable for some fun sites. By no means to the service or through some aspect of financial services.
It is about psychology and its influence on the visitor in terms of trust.
Yes, I agree with you that the predominantly yellow website interface creates a sense of clowning. Therefore, the yellow color in website design should be used with great care. It can only be used as a secondary color, not as a base color.
The blue color goes well with white (and looks very solid) so I really like the new blue and white signature. At the same time, a small addition of yellow or light brown color, in my opinion, will add brightness and cheerfulness to the site design. This is also very important.
Finance (money), on the one hand, is indeed a very serious entity, but on the other hand, money is energy. Energy is associated in people with the sun and yellow. No wonder the main symbol of wealth is gold.
In this case, of course, you should not focus on the yellow color (this would be wrong).