Creating a crochet rose-patterned table runner with a modified crab stitch and a leaf base involves a series of steps. Here’s a simplified guide to get you started:

Materials needed:

1. Crochet yarn in desired colors
2. Crochet hook appropriate for your yarn weight
3. Scissors
4. Yarn needle

Steps:

1. Choose Yarn and Hook:
   • Select the yarn colors you want for the roses, leaves, and the runner itself.
   • Choose a crochet hook that complements your yarn weight.
2. Make the Roses:
   • Begin with a magic ring or chain 4 and join to form a ring.
   • Create the center of the rose by working single crochets and slip stitches into the ring.
   • Gradually increase stitches to form the petals, alternating between single crochets and other stitches to create texture.
   • Repeat the process for as many roses as you want on your table runner.

1. Create Leaves:
   • Crochet leaves separately. You can use a basic leaf pattern or find a specific crochet leaf pattern online.
   • Attach the leaves to the roses by sewing or crocheting them together.
2. Make the Table Runner Base:
   • Decide on the size and width of your table runner and start crocheting the base using your chosen stitch (e.g., single crochet, double crochet).
   • Keep the width consistent, and crochet until you reach the desired length.

1. Incorporate Rose and Leaf Motifs:
   • Position the roses and leaves on the table runner where you want them.
   • Attach each motif securely to the runner using a yarn needle or by crocheting them together as you go.
2. Add Crab Stitch Border:
   • Once all motifs are attached, add a crab stitch border around the entire table runner.
   • The crab stitch (reverse single crochet) gives a nice, decorative edge. Work single crochet stitches in the reverse direction along the edge.

1. Finish and Block:
   • Weave in any loose ends, and block your table runner to shape it nicely. Blocking helps the stitches settle and gives your project a more professional look.

Feel free to adapt the pattern based on your preferences, and don’t hesitate to explore online resources or crochet communities for more detailed patterns and inspiration.