How do you hide gaps in decking?

I have just installed decking in my garden and there is an unslightly gap between the cut edges of the deck and the wall. what is the best thing to cover this gap? the gap is perpendicular with the edges of the deck boards but not consistent as the wall is not exactly straight. any advice would be much appreciated
Answer
My husband has installed decking in my garden. we too had an unsightly gap between the decking and fence. i went to b & q and bought a few bags of their rainbow pebbles, £9.99 per bag, and have stacked them in all the gaps to form an attractive border. they really glisten and look absolutely fab. or maybe try some coloured slate chippings. they all disguise the gaps really well. hope this helps.