The images show it all; Hostas are grown for their impressive foliage which is very varied both in size and colour. There are Hostas with bright green leaves, striped leaves, grey and blue leaves, gold and green and all different shades of green. Hostas also vary much in size, some are very small no more than a few centimeters across up to giant Hostas, which can grow up to a meter across and which make a dramatic statement in a border.
Generally, in terms of leaf colour, most Hosta grow best if they are planted in semi shade, although the yellow-leaved Hostas will endure more sun. Hostas mix well in borders, but also make a bold statement when planted on their own. When planting a Hosta, bear in mind it's possible eventual size and leaf shape which can mean, because some Hostas grow very large, there is no point in planting too close as when the leaves do emerge, they will shadow anything nearby, although if it's also a shade loving plant the combination may work.
I have found common spotted orchid quietly growing in the shade under the leaves of a large Hosta. If you are planting Hosta in a shady spot bear some varieties will look better in shade than others. The blue leaved Hostas can look a bit dull in shade, and the yellow leaved will not do as well in shade. The best varieties for shade are those with green and yellow variegation on their leaves, such as Hosta fortunei var.aureomarginata (AGM)