I think Ive got it. Still not sure what to do (or not to do) about the border. Maybe place some webs around with fat, dangling spiders.
The fabric will be 32 ct lugana shadowbrook which is sort of a murkey, green, purple, brown; very Halloweeny.
Now Im hoping that Three Gables and Haunted Tree House by Cross-Eyed Cricket are within my block size needs (round 100 x 100)
For those who want to know - here is the chart list :o)
Cross-eyed Cricket - Haunted Tree house (#246), Three gables (#187), Sleepy Hollow (#274)
Prairie Schooler - November (house), When Witches go Riding (house), Pumpkin Patch (house)