I am wondering if I am not alone on this one.

With my Necrowarrior, I sometimes do certain rituals.

Because she is good moraled she forbids herself to ressurect innocents, or use any dead thralls. So instead she sometimes performs certain "rituals" to stay in touch with the dead. My latest ritual was pretty odd. I placed a skull on the ground, surrounded with four Nightshade flowers. I made sure it was at a suitable location and time. So Hrafna (Her name) performed this ritual at night time somewhere near the graveyard of Falkreath.

Anyway, are there other people who do similiar things in roleplay?

I don't know if I'd call it a ritual, but my more benevolent characters never take anything off of dead NPCs and will often leave something of tribute when leaving a tomb/crypt.

It is similar.

My burly Nord's ritual is to down 5 bottles of mead and then proceed to divide an Elf's skull in half.

Another ritual I like to do is collect all the Dark Brotherhood contracts against me from the dead assassins. Once I have a sizable amount, I'll do a nice big (one time only) "return to sender"... if you know what I mean?