"ActueleRentestanden": are 2 words. This has to be clear in the logo. So think about different typography, different colors or maybe below each other etc. So it's way better readable for a long word.
We are open to suggestion, but also include a version which has our current scheme! (Red: #990033, Blue: #2266bb)
We only need to match our branding in our site, so without too much hassle we can switch to other colors.
It's important that the logo can be used in full black/gray/white without losing his identity.
The main reason why we are looking for a new logo, is that our current one can't be fit as favicon/app-icon. And nowadays with so many devices/places across the internet we need a good looking one. The icon may be used apart from "ActueleRentestanden.nl".
You may (but don't have to!) use obvious signs like a percent(%) sign within the icon. But when you use those, it's highly important to create one with it's own identity. So when you see that percent sign, you'll recognize direct it's from actuelerentestanden.nl.
Good luck! And make sure to check our site https//www.actuelerentestanden.nl so you'll know where the logo must fit in.