cevenn - no, the folder is correct - though I'd make sure your files actually got copied (Advanced Clock Plugin doesn't actually take any icons from your current theme, all of its images are in their own folders). Honestly, I don't know what the issue is.

Meanwhile, on a happier note: CpuMem Clock!
CpuMemClock.tar
(Same process - unpack to the root directory / and it should put it into the right folder from there.) Restart hildon-status-menu or reboot to let it get loaded up, or else it won't show up.

As per bitrocky's idea: this is a clock style including just CPU and MEM bars under the time. The bars resize with the size changes of the clock - length-wise at least (height-wise they're always three pixels - the size of the CPUMEM Applet's bars).

Everything else is the same, except since they're now horizontal, RAM use is from right to left, CPU is from left to right. Even when full they never touch. To make it more obvious that the cpu bar maxed out, I made the fifth bar for the cpu graph red.