Sympathy cards can be quite challenging to make. I try to incorporate something of the person who has passed on the card. If that fails, then I work with a seasonal theme. Here is a card that had to go seasonal since I didn't know the individual, only her children.
The A-2 card base is off-white. A 2nd piece was cut slightly smaller. From that piece I die cut one of Tim's mini oak leaves. Decorative paper was placed behind the cut out and added as a belt across the bottom of the card. I placed the die cut atop this and added a mini acorn (Tim Holtz die) on top of that, also cut from the decorative paper.
The sentiment is from the Renaissance Stamp Collection and stamped with Coffee Archival Ink.
I found the inspiration for this card on Pinterest (boy, can this place get you in trouble with time management!). Here's the link to the individual's website. Maybe you'll find it sparks an idea or two for you.