Ican, I'm so sorry for you as your childrens loss!! You husband sounds like he was a lovely man.
I lost my dad 3 and half years ago and my do we're devestated (very close to there grandad)
And we decided to do this for them and thought maybe you would like to as well.
My dc wrote letters and attached them to balloons which they had drawed over and said they would send th off to grandad they loved the idea and they were smiling and happy whist doing it.
Grief has horrible stages all hard in there own way, I look back at the firsts months and think how on earth did anyone get through any of that!! But it's strange, it's no so much that it gets easier its mostly you learn to live with it, if that makes sense? You finally realise there not coming home, or you no longer go to call them for something and realise, and do thins you used to do with your lovely husband will soon be replaced by something new. This is how my mum describes it and from my point of view it feels the same too.
I will be thinking of you and hope that your grow process will e easy on you and one day you will be able to laugh again and actual smile when thinking of your husband.
Also maybe the last thing you will w thinking about now but a little memory box for the children would be lovely, all the bid that remind you of him xxx