Swing set with arbor-like elements. The landscaping around the family homestead on which this swing set is built is an amazing example of DIY ingenuity in conjunction with help from a landscape designer to formulate the overarching plan.
Reuse an old tree to make a log pathway in your garden. Good use of "yard" trees and other wood that can't be milled; works much better in climates without termites. Good drainage under the log rounds will make the path last longer.
Where the dogs have worn the path down. Utilize reclaimed pallet wood to build a rustic wooden walkway. You can use it to link two areas of your backyard, or to add some character to a quiet corner. Get the tutorial at Funky Junk Interiors.