Although Silver How is closer and even Stone Arthur is within easy striking distance I've always thought of Helm Crag as being Grasmere's own fell. Just as I think Latrigg is to Keswick and Wansfell Pike is to Ambleside.
I've known Helm Crag as long as I can ever remember, although it wasn't until I started fell walking that I found out it had a proper name. When we were on our days out as kids we were always told to look at the 'Lion and the Lamb', and as a not very interested youngster, I just assumed that was it's name. Little did I realise that one day I'd actually want to walk up here time and time again, eventually coming face to face with these two creatures, , , or not coming face to face as it turned out. If you decided it would be good idea to climb Helm Crag to seek out two big rocks, one in the shape of a lion and the other in that of a lamb, well, I'm sorry to say you won't find them. That's not to say you can't find the two rocks in question, it's just that they're found among a large collection misshapen rocks and boulders strewn about the summit of the fell. These rock range from the size of building brick to one named the Howitzer, as big as a transit van standing on its end.
It is possible to clamber up to the top of The Howitzer. I've seen lots of people do it, and heard of others who've 'topped out' on here. Speaking for myself as a total none climber, I can't see me ever doing this. Getting up would be fine, getting down however, this something I would not be comfortable with.